Saves having this defined in 20+ places. If we ever make any changes to
shear, it's 100% going to need to be applied to every usage (there will
never be a case of multiple different shears in the game).
Also fixes a mismatching definition in `ShearedNub`.
The point is to apply the transitions against a container that's inside of `ScreenFooterButton`, because the `ScreenFooterButton` drawable's position is being controlled by the flow container it's contained within, and we cannot apply the transitions on it directly.
When shear factors differ between components that are close to each other (`BackButtonV2` and `ScreenFooterButton` in this case), they look completely ugly.